<template>
  <div class="lottery-box" id="app">
    <h1 class="title">您目前还有 {{score}} 次抽奖机会</h1>
    <div class="lottery">
      <div class="lottery-item">
        <div class="lottery-start">
          <div class="box gray" v-if="score === 0">
            <p><b>抽奖</b></p>
            <p>没有抽奖次数</p>
          </div>
          <div class="box" @click="startLottery" v-if="score !== 0">
            <p><b>抽奖</b></p>
            <p>抽奖一次</p>
          </div>
        </div>
        <ul>
          <li v-for="(item,i) in list" :key="item.img" :class="i==index?'on':''">
            <div class="box">
              <p><img src="@/assets/j1.png" alt=""></p>
              <p>{{item.awardname}}</p>
            </div>
          </li>
        </ul>
      </div>
    </div>
    <!-- 中奖弹窗 -->
    <div class="mask" v-if="showToast"></div>
    <div class="lottery-alert" v-if="showToast">
      <h1>恭喜您</h1>
      <p><img src="@/assets/j1.png" alt=""></p>
      <h2>获得{{list[index].awardname}}</h2>
      <div class="btnsave" @click="showToast = false">确定</div>
    </div>
  </div>
</template>
<script>
  export default{
      name: "amuse-prize",
      data() {
        return {
          score:1,
          list:[],   //奖品1-9
          index: -1,  // 当前转动到哪个位置，起点位置
          count: 8,  // 总共有多少个位置
          timer: 0,  // 每次转动定时器
          speed: 200,  // 初始转动速度
          times: 0,    // 转动次数
          cycle: 50,   // 转动基本次数：即至少需要转动多少次再进入抽奖环节
          prize: -1,   // 中奖位置
          click: true,
          showToast: false, //显示中奖弹窗
        }
      },
      async mounted(){
        let {code ,data ,msg} = await this.$post('/awarding')
        if(code === 200) {
          this.score = data.awardtime
          this.list = data.award
        }else {
          this.$message.error(msg)
        }
      },
      methods:{
        async startLottery(){
          if (!this.click) { return }
          this.startRoll()
        },
        async awardRecord () {
          let award = this.list[this.index].awardname
          console.log(award)
          let {code, data, msg} = await this.$post('/awardrecord',{
            data: {'awardname': award}
          })
          if(code === 200) {
            console.log(data)
          } else{
            this.$message.error(msg)
          }
        },
        // 开始转动
        startRoll () {
          this.times += 1 // 转动次数
          this.oneRoll() // 转动过程调用的每一次转动方法，这里是第一次调用初始化
          // 如果当前转动次数达到要求 && 目前转到的位置是中奖位置
          if (this.times > this.cycle + 10 && this.prize === this.index) {
            clearTimeout(this.timer)  // 清除转动定时器，停止转动
            this.prize = -1
            this.times = 0
            this.speed = 200
            this.click = true;
            this.score -= 1        //抽奖次数减一
            var that = this;
            this.awardRecord()
            setTimeout(()=>{
              that.showToast = true;
            },500)
          } else {
            if (this.times < this.cycle) {
              this.speed -= 10  // 加快转动速度
            } else if (this.times === this.cycle) {
              const index = parseInt(Math.random() * 10, 0) || 0;  // 随机获得一个中奖位置
              this.prize = index; //中奖位置,可由后台返回
              if (this.prize > 7) { this.prize = 7 }
            } else if (this.times > this.cycle + 10 && ((this.prize === 0 && this.index === 7) || this.prize === this.index + 1)) {
              this.speed += 110
            } else {
              this.speed += 20
            }
            if (this.speed < 40) {this.speed = 40}
            this.timer = setTimeout(this.startRoll, this.speed)
          }
        },
        // 每一次转动
        oneRoll () {
          let index = this.index // 当前转动到哪个位置
          const count = this.count // 总共有多少个位置
          index += 1
          if (index > count - 1) { index = 0 }
          this.index = index
        },
      }
  }
</script>

<style scoped lang="scss">
  * {
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
  }
  img {
    border: 0px;
  }
  ul, li {
    list-style-type: none;
  }
  .lottery-box {
    overflow: hidden;
    margin: auto;
    margin-bottom: 30px;
  }
  .lottery-box .title {
    text-align: center;
    padding: 50px 0;
    font-size: 18px;
    color: black;
  }
  .lottery {
    animation: changeBg .5s ease infinite;
    overflow: hidden;
    padding: 20px;
    width: 400px;
    margin: 0 auto;
    background-repeat: no-repeat;
    background-size: 100% 100%;
  }
  @keyframes changeBg {
    0% { 
      background: url('~@/assets/k1.png');
      background-repeat: no-repeat;
      background-size: 100% 100%;
    }
    100% {
      background: url('~@/assets/k2.png');
      background-repeat: no-repeat;
      background-size: 100% 100%;
    }
  }
  .lottery .lottery-item {
    height: 340px;
    position: relative;
    margin-top: 10px;
    margin-left: 10px;
  }
  .lottery .lottery-item ul li {
    width: 33.33333333%;
    position: absolute;
    padding-right: 10px;
  }
  .lottery .lottery-item ul li:nth-child(2) {
    left: 33.33333333%;
  }
  .lottery .lottery-item ul li:nth-child(3) {
    left: 66.66666666%;
  }
  .lottery .lottery-item ul li:nth-child(4) {
    left: 66.66666666%;
    top: 110px;
  }
  .lottery .lottery-item ul li:nth-child(5) {
    left: 66.66666666%;
    top: 220px;
  }
  .lottery .lottery-item ul li:nth-child(6) {
    left: 33.33333333%;
    top: 220px;
  }
  .lottery .lottery-item ul li:nth-child(7) {
    left: 0;
    top: 220px;
  }
  .lottery .lottery-item ul li:nth-child(8) {
    left: 0;
    top: 110px;
  }
  .lottery .lottery-item ul li .box {
    height: 100px;
    position: relative;
    text-align: center;
    overflow: hidden;
    background: url('~@/assets/bg2.png') no-repeat center;
    background-size: 100% 100%;
  }
  .lottery .lottery-item ul li .box img {
    display: block;
    height: 50px;
    margin: 0 auto;
    margin-top: 10px;
    margin-bottom: 5px;
  }
  .lottery .lottery-item ul li .box p {
    color: #708ABF;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 14px;
  }
  .lottery .lottery-item ul li.on .box {
    background: url('~@/assets/bg1.png') no-repeat center;
    background-size: 100% 100%;
  }
  .lottery .lottery-item ul li.on .box p {
    color: #fff;
  }
  .lottery .lottery-item .lottery-start {
    position: absolute;
    left: 33.33333333%;
    width: 33.33333333%;
    top: 110px;
    padding-right: 10px;
  }
  .lottery .lottery-item .lottery-start .box {
    height: 100px;
    font-size: 14px;
    color: #fff;
    cursor: pointer;
    text-align: center;
    overflow: hidden;
    background: url('~@/assets/bg1.png') no-repeat center;
    background-size: 100% 100%;
  }
  .lottery .lottery-item .lottery-start .box p b {
    font-size: 40px;
    margin-top: 16px;
    margin-bottom: 15px;
    line-height: 30px;
    display: block;
  }
  .lottery .lottery-item .lottery-start .box:active {
    opacity: 0.7;
  }
  .lottery .lottery-item .lottery-start .box.gray {
    background: url('~@/assets/bg3.png') no-repeat center;
    background-size: 100% 100%;
  }
  .lottery .lottery-item .lottery-start .box.gray p {
    color: #708ABF;
    font-weight: bold;
  }
  .mask {
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    position: fixed;
    overflow: hidden;
    z-index: 222;
    top: 0;
    left: 0;
  }
  .lottery-alert {
    max-width: 400px;
    text-align: center;
    z-index: 10000;
    border-radius: 10px;
    background: #fff;
    padding: 20px;
    position: fixed;
    left: 0;
    right: 0;
    margin: auto;
    top: 50%;
    transform: translateY(-50%);
  }
  .lottery-alert h1 {
    font-size: 18px;
    font-weight: bold;
    color: #D92B2F;
  }
  .lottery-alert img {
    display: block;
    height: 120px;
    margin: 0 auto;
  }
  .lottery-alert h2 {
    font-weight: normal;
    color: #D92B2F;
    font-size: 15px;
    padding-top: 15px;
  }
  .lottery-alert p {
    color: #666;
    font-size: 16px;
    padding-top: 5px;
  }
  .lottery-alert .btnsave {
    border-radius: 3px;
    box-shadow: none;
    height: 40px;
    cursor: pointer;
    line-height: 40px;
    color: #fff;
    margin-top: 12px;
    background: linear-gradient(180deg, rgba(213,60,63,1) 0%, rgba(201,20,24,1) 100%);
    font-size: 16px;
  }

</style>